title: Holographic optical element to generate achromatic vortices.
abstract: A compound holographic optical element to generate achromatic vortices with high efficiency, based on the combination of two volume phase holograms, is designed and constructed. This element is compact and easy to align. It has high damage threshold, so it can be used with ultraintense laser pulses.
authors.forename: Jesús
authors.initials: J
authors.lastname: Atencia
authors.forename: María-Victoria
authors.initials: MV
authors.lastname: Collados
authors.forename: Manuel
authors.initials: M
authors.lastname: Quintanilla
authors.forename: Julia
authors.initials: J
authors.lastname: Marín-Sáez
authors.forename: Iñigo J
authors.initials: IJ
authors.lastname: Sola